#nav{ width:1920px; height:116px;}
#nav ul{ width:1714px; margin:0;padding:0;}
#nav ul li { float:left; position:relative; list-style:none; margin-left:55px;}
#nav ul li a{ text-decoration:none; display:block; height:116px; width:230px; text-align:center; line-height:116px; font-family:'微软雅黑'; font-size:21px;
 color:#fff; background:#333333;}
#nav ul li a:hover{ background:#e7512a;}
#nav ul li ul{ position:absolute; left:-323%; top:116px; display:none;z-index: 999;opacity:0.7;}

#nav ul li ul li { float:none; width:230px; height:70px; margin-left:auto; margin-right:auto;}
#nav ul li ul li a{ font-family:'微软雅黑'; font-size:21px; color:#fff; display:block; width:230px; height:70px; text-align:center; line-height:70px;}

#nav ul li ul li a:hover{ background:#e7512a;}

#nav ul li:hover ul{ display:block;}
